用代码初始化APP的window

该例介绍如何用代码这创建iPhone的app的window，这样可以使我们的app不依赖任何nib文件，完全邮代码实现。

1.创建基于"window-based application"的新项目"CodingWindowDemo";

2.删除MainWindow.xib文件；

3.删除CodingWindowDemo-Info.plist文件中"Main nib file base name"行;

4.修改main.m代码：

将原来行：
int retVal = UIApplicationMain(argc, argv, nil, nil);

改为：
int retVal = UIApplicationMain(argc, argv, nil, @"CodingWindowDemoAppDelegate");

5.修改CodingWindowDemoAppDelegate.h后代码如下：

#import <UIKit/UIKit.h>

@interface CodingWindowDemoAppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
}

//@property (nonatomic, retain) IBOutlet UIWindow *window;

@end

6.修改CodingWindowDemoAppDelegate.m后代码如下：

#import "CodingWindowDemoAppDelegate.h"

@implementation CodingWindowDemoAppDelegate

//@synthesize window;

#pragma mark -
#pragma mark Application lifecycle

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    
    // Override point for customization after application launch.
    window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    window.backgroundColor = [UIColor blueColor];
    
    //这里可以加入加载view的代码
    //...
  
    [window makeKeyAndVisible];
    
    return YES;
}

#pragma mark -
#pragma mark Memory management

- (void)dealloc {
    [window release];
    [super dealloc];
}


@end

 

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